Display device for electronic apparatus comprising solar cell

ABSTRACT

In a display device for an electronic apparatus, a circular polarizing plate constituted by a linear polarizing plate  42  and a ¼λ plate  43  is provided between a solar display board  41  and a middle frame  46  for fixing a module  45  having a solar cell  44  to an outer case. As a result, a boundary line between the middle frame  46  and the solar cell  44,  a gate track generated through injection molding of the middle frame  46,  and further more, a solar cell element dividing line of the solar cell  44  cannot be seen. Consequently, a variation in design of the solar display board  41  can be increased. Moreover, the color of the solar display board  41  is deepened so that a feeling of high quality can be obtained as goods, and the provision of the middle frame can provide various external shapes of a watch in respect of the design.

FIELD OF THE INVENTION

The present invention relates to a display device for an electronicapparatus comprising a solar cell, for example, an electronic apparatussuch as a watch, an electronic calculator, a radio, a battery charger,and more particularly the watch.

BACKGROUND ART

An example of a conventional structure of a watch having a solar cell305 will be described in detail with reference to FIG. 26. FIG. 26(a) isa plan view showing the inside of the watch case seen from above andFIG. 26(b) is a schematic sectional view showing the inside of the watchcase.

As shown in FIG. 26, when light is incident on a solar display board 301of a watch from the outside, the light is transmitted through the solardisplay board 301 to reach the solar cell 305. Then, the solar cell 305converts an optical energy into an electric energy which is charged intoa battery or capacitor referred to as a secondary battery which isprovided in a module 307 and can store electricity. The module 307includes a drive mechanism for the watch so that a minute hand 310 andan hour hand 309 which are fixed to a central shaft 308 are movedthereby. In this case, the solar display board 301 is positioned betweenthe minute hand 310 and hour hand 309 and the solar cell 305.

In recent years, the power generation efficiency of the solar cell hasbeen enhanced, the power consumption of a module has been reduced, andfurthermore, battery performance has been improved. Consequently, evenif the external shape of a solar cell is much smaller than ever, aminute hand and an hour hand can be driven.

On the other hand, the degree of freedom has been increased for theexternal shape of a watch case depending on the diversification of thedesign of the watch. A middle frame 306 is positioned on the outside ofthe solar cell 305 and the module 307 so that the degree of freedom canbe enhanced in respect of the design of the external shape of the watch.

As shown in FIGS. 26(a) and (b), the solar cell 305 and the module 307are fixed through the middle frame 306 to an outer case which is notshown. Moreover, the minute hand 310 and the hour hand 309 are bonded tothe central shaft 308 which extends from the module 307 and are rotatedthrough a driving force applied from the module 307. Furthermore, thesolar display board 301 is provided to cover the solar cell 305 and themiddle frame 306.

The middle frame 306 is provided with a hook mechanism in order to fixthe module 307 to which the solar cell 305 is fastened, which is notshown. When the module 307 is fitted in the middle frame 306, the solarcell 305 and the module 307 are fixed to the middle frame 306 and areaccommodated in the outer case and thus fixed therein.

The solar cell 305 has two kinds of substrates, that is, substratesformed of a glass and a resin. For both of them, the solar cell itselfhas a small thickness. Furthermore, there is a possibility that thesubstrate formed of a glass might be chipped through a stress such as ashock during or after assembly. The substrate formed of a resin might bedeformed by a stress thereof during bonding. For a method of fixation tothe watch case, therefore, the solar cell 305 and the middle frame 306are not fixed but the module 307 and the middle frame 306 are fixed. Inthe case of the substrate formed of a resin, a metal plate may beprovided on the lower face of the solar cell 305 in order to enhance thereliability of rigidity and electrical connection.

Furthermore, in the case in which the solar display board 301 comes incontact with the solar cell 305, the power generation efficiency of thesolar cell 305 might be reduced due to a flaw or the like. Therefore,the middle frame 306 also has the function of preventing the reductionof the power generation. When the solar display board 301 is superposedon the solar cell 305, the middle frame 306 protrudes slightly upwardfrom the upper face of the solar cell 305 such that the middle frame 306comes in contact with the solar display board 301 earlier than the solarcell 305.

Moreover, in the case in which the module 307 having the solar cell 305fixed thereto is to be incorporated into the middle frame 306, theincorporation can easily be carried out efficiently and productivity canbe enhanced if the external shape of the solar cell 305 is coincidentwith that of the module 307 as shown. As described above in detail, themiddle frame is a member which plays an important role in watchconstruction.

As shown in FIG. 26(a), a boundary line 303 between the solar cell 305and the middle frame 306 usually requires a clearance for watchassembling work and the clearance is seen to be black through the solardisplay board 301. Moreover, a plastic material is often used for themiddle frame 306 in consideration of easiness of molding, cost, shockabsorption and the like. The middle frame 306 is manufactured byinjection molding to correspond to the shape of various outer cases.Therefore, a gate track 304 is formed on an upper face of the middleframe 306 due to the injection molding and the gate track 304 is alsoseen through the solar display board 301. Furthermore, in the case inwhich a solar cell is divided into some elements to maintain apredetermined voltage and current, a refractive index of light is varieddepending on a difference in a material between a cell portion and adividing line portion and a solar cell element dividing line 302 is alsoseen through the solar display board 301.

According to the knowledge of the present inventors, such a phenomenonremarkably presents itself when the solar display board 301 is black orblue. FIG. 26 shows an example in which the solar cell element dividingline 302 has a cross-shape and the boundary line 303 between the solarcell 305 and the middle frame 306 has the shape of a black ring on theboundary between a slant line portion and a dotted portion.

For a technique for seeing such a solar cell element dividing line withdifficulty, a method disclosed in Japanese Patent Publication No. Hei5-38464 has conventionally been proposed.

In the Japanese Patent Publication No. Hei 5-38464, only a colordiffusing board is provided between the solar display board 301 and thesolar cell 305. However, the diffusing board has the function ofdiffusing light. Therefore, the boundary line 303 between the solar cell305 and the middle frame 306, the gate track 304 generated through theinjection molding of the middle frame, and furthermore, the solar cellelement dividing line 302 are seen with difficulty. As a result, theyare necessarily seen to be white so that the tone of the solar displayboard 301 provided thereabove is affected.

According to an experiment carried out by the present inventors, if onlythe color diffusing board is provided between the solar display board301 and the solar cell 305, a black solar display board is seen to begray, which is not preferable in respect of design. Moreover, a whitesolar display board has diffusion effects by itself. Therefore, even ifthe diffusing board is not used, there is not such a phenomenon that theboundary line 303 between the solar cell 305 and the middle frame 306,the gate track 304 generated through the injection molding of the middleframe 306, and furthermore, the solar cell element dividing line 302 areseen through the solar display board 301. Therefore, it is not necessaryto provide the diffusing board as in the Japanese Patent Publication No.Hei 5-38464.

Usually, various designs are given through the solar display board 301.If there is such a phenomenon that the boundary line 303, the gate track304 and the solar cell element dividing line 302 are seen as describedabove, the quality of design of a watch is adversely affected. Morespecifically, in this case, a decoration or the like should be given toa part of the solar display board 301 or the whole surface thereof inorder to hide the above-mentioned phenomenon. Therefore, the design forthe solar display board 301 is restricted so that a feeling of highquality for a watch is eliminated.

In the three phenomena adversely affecting the design quality asdescribed above, the solar cell element dividing line 302 can beconsiderably improved by giving a protective coat formed of an epoxyresin which has SiO₂ particulates distributed therein over the wholesurface of the solar cell 305. Moreover, there is a possibility that thegate track 304 generated during the injection molding of the middleframe 306 can also be improved by changing a gate position. However, theboundary line 303 between the solar cell 305 and the middle frame 306,that is, the clearance cannot be avoided for the watch assembling workand is the most harmful and measures are taken with difficulty.

In the experiment carried out by the present inventors, the colors ofblack and blue solar display boards are caused to be deeper, a feelingof high quality can be obtained for goods by the deeper colors, andfurthermore, it is possible to eliminate such a drawback that theobservation through the solar display board described above is caused.However, transmitted light does not fully reach the solar cell itself sothat the power generation efficiency is reduced and the operation of thewatch is stopped.

Moreover, when the tone of the middle frame is adapted to that of thesolar cell, it is possible to eliminate such a drawback that theobservation through the solar display board described above is caused.However, the boundary line between the solar cell and the middle frameis seen so that the drawback cannot be eliminated completely.Furthermore, when a white paint is thinly applied to the solar cell sideof the blue solar display board having a blue resin kneaded therein, itis possible to eliminate such a phenomenon that the boundary line 303between the solar cell 305 and the middle frame 306, the gate track 304generated through the injection molding of the middle frame 306, andfurthermore, the solar cell element dividing line 302 are seen throughthe solar display board 301. However, the depth of the color of thesolar display board 301 is eliminated by the diffusing function of thewhite paint so that the feeling of high quality for the single solardisplay board disappears. In otherwords, the formation of a diffusionlayer cannot obtain sufficient effects.

In a display board such as a watch dial, various coloring and patternsare applied to the surface or back of the display board or both of themin order to give a feeling of high quality (added value) in some cases.The coloring is carried out by printing the surface of a material to bethe display board or manufacturing the display board from a resincontaining a pigment, for example. In the case of a metallic displayboard, moreover, the pattern on the surface thereof is formed throughetching, a matte processing or the like. In the case of a display boardformed of a resin, a pattern is formed by injection molding the resin ina mold having the pattern formed therein.

However, the above-mentioned display boards are not satisfactory inrespect of the depth of a pattern, a three-dimensional effect and thelike.

In consideration of such circumstances, it is an object of the presentinvention to provide a display device for an electronic apparatuscomprising a solar cell and a middle frame for fixing the solar cell anda module to an outer case in which necessary and sufficient light can becaused to reach the solar cell, a feeling of high quality can be given,and furthermore, it is possible to increase a variation in design inwhich a decorative property is great and the depth of a pattern and athree-dimensional effect are excellent.

SUMMARY OF THE INVENTION

The present invention solves the problems of the conventional artdescribed above by providing a display device for an electronicapparatus comprising a solar cell, wherein a circular polarizing platefor transmitting light is provided on the front side of the solar cellin a direction of incidence of light.

In a circular polarizing plate constituted by a linear polarizing plateand a phase difference plate, the linear polarizing plate and the phasedifference plate are provided in this order in a direction of incidenceof light. Consequently, light reflected by a solar cell surface can beblocked, a boundary line between the solar cell and the middle frame, agate track generated through injection molding of the middle frame, anda solar cell element dividing line cannot be seen through the circularpolarizing plate.

Consequently, the tone of the solar display board is not affected.Moreover, it is not necessary to hide the three drawbacks through astripe-shaped pattern or the like. Thus, a variation in design of thesolar display board can be increased. Furthermore, a solar display boardhaving a deep color can be used so that a feeling of high quality canvisually be obtained as goods. By directly giving marking such as anumeral to the linear polarizing plate by means of printing or the like,the function of the solar display board can also be given to the linearpolarizing plate itself.

Moreover, the present invention is characterized in that the surface ofthe circular polarizing plate is provided with a solar display boardconstituted by a resin substrate having a pattern, an in organicsubstrate having a pattern or a decorating thin film member or acombination thereof.

Therefore, a decorative property is great, the pattern becomes rich andan excellent three-dimensional effect can be obtained. Through acombination of two or more patterns or two or more materials, moreover,it is possible to manufacture a display board having a better feeling ofbeauty than ever. Thus, a design variation can be increased.

By such a structure, it is possible to provide a display device for anelectronic apparatus comprising a solar cell capable of maintaining thenecessary and sufficient power generation efficiency of the solar cell,giving a feeling of high quality and increasing a variation in design.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic sectional view showing the inside of a watch caseaccording to a first embodiment of the present invention,

FIG. 2 is a schematic sectional view showing the inside of a watch caseaccording to a second embodiment of the present invention,

FIG. 3 is a schematic sectional view showing the inside of a watch caseaccording to a third embodiment of the present invention,

FIG. 4 is a schematic sectional view showing the inside of a watch caseaccording to a fourth embodiment of the present invention,

FIG. 5 is a schematic sectional view showing the inside of a watch caseaccording to a fifth embodiment of the present invention,

FIG. 6 is a schematic sectional view showing the inside of a watch caseaccording to a sixth embodiment of the present invention,

FIG. 7 is a schematic sectional view showing the inside of a watch caseaccording to a seventh embodiment of the present invention,

FIG. 8 is a schematic sectional view showing the inside of a watch caseaccording to an eighth embodiment of the present invention,

FIG. 9 shows the inside of a watch case according to a ninth embodimentof the present invention, FIG. 9(a) being a schematic sectional viewshowing the inside of the watch case and FIG. 9(b) being a front viewshowing the inside of the watch case seen from above,

FIG. 10 is a schematic sectional view showing the inside of a watch caseaccording to a tenth embodiment of the present invention,

FIG. 11 is a schematic sectional view showing the inside of a watch caseaccording to an eleventh embodiment of the present invention,

FIG. 12 is a schematic sectional view showing the inside of a watch caseaccording to a twelfth embodiment of the present invention,

FIG. 13 is a schematic sectional view showing the inside of a watch caseaccording to a thirteenth embodiment of the present invention,

FIG. 14 is a partially enlarged sectional view showing a solar displayboard according to the thirteenth embodiment of the present invention,

FIGS. 15(A)-15(C) are schematic views showing the steps of a method ofmanufacturing a resin substrate having a pattern according to thepresent invention.

FIG. 16 is a schematic view showing a method of forming the resinsubstrate having a pattern through a thermal press according to thepresent invention,

FIG. 17 is a schematic view showing another method of forming the resinsubstrate having a pattern through a thermal press according to thepresent invention,

FIG. 16 is a partially enlarged sectional view showing a solar displayboard according to a fourteenth embodiment of the present invention,

FIG. 19 is a partially enlarged sectional view showing a solar displayboard according to a fifteenth embodiment of the present invention,

FIG. 20 is a partially enlarged sectional view showing a solar displayboard according to a sixteenth embodiment of the present invention,

FIG. 21 is a partially enlarged sectional view showing a solar displayboard according to a seventeenth embodiment of the present invention,

FIG. 22 is a partially enlarged sectional view showing a solar displayboard according to an eighteenth embodiment of the present invention,

FIG. 23 is a partially enlarged sectional view showing a solar displayboard according to a nineteenth embodiment of the present invention,

FIG. 24 is a partially enlarged sectional view showing a solar displayboard according to a twentieth embodiment of the present invention,

FIG. 25 is a partially enlarged sectional view showing a solar displayboard according to a twenty-first embodiment of the present invention,

FIGS. 26(a)-26(b) show the state of the inside of a watch case accordingto a conventional example, FIG. 26(a) being a front view showing theinside of the watch case seen from above and FIG. 26(b) being aschematic sectional view showing the inside of the watch case.

FIG. 27 is a perspective view showing the principle of an operationaccording to the present invention,

FIG. 28 is a chart in which light emitted from a phase difference boardis divided into x and y directions according to the present invention,and

FIG. 29 is an XY table diagram showing a direction of an oscillation ofthe light emitted from the phase difference board according to thepresent invention.

DETAILED DESCRIPTION THE INVENTION

Embodiments of the present invention will be described below.

First of all, the function of a circular polarizing plate will bedescribed with reference to FIGS. 27 to 29.

The circular polarizing plate is usually fabricated by bonding a linearpolarizing plate 111 formed of a film material to a ¼ λ plate 112 formedof a film material with an adhesive layer. As a matter of course, if thecircular polarizing plate has the circular polarizing function, otherstructures and members maybe used. Moreover, the linear polarizing platemay have such a structure that a polyvinyl alcohol thin film absorbingiodine is extended in one direction and molecules are arranged inparallel and are sandwiched with acetylbutyl cellulose. Furthermore, alens or lens group for collecting light in one direction maybe used.Since mirror reflection can be suppressed, the linear polarizing plateis used for improving a contrast or lessening the fatigue of eyes.

The linear polarizing plate 111 has an absorption type or a reflectiontype. An absorption axis or a reflection axis is present orthogonally toa transmission axis. When natural light for oscillation in everydirection is incident on the linear polarizing plate 111 as shown inFIG. 27, only light in the same oscillating direction as thetransmission axis is transmitted. In the absorption type, the lightincident on the linear polarizing plate 111 is absorbed in thepolarizing plate. Moreover, the reflection type has the function ofreflecting the light incident on the linear polarizing plate 111 from asurface of the polarizing plate.

The embodiments according to the present invention will be described byusing an absorption type linear polarizing plate and a ¼ λ plate as thelinear polarizing plate and the phase difference plate if specialdescription is not given.

The transmitted light polarized in one direction is incident at an angleof 45° with respect to a delay axis of the phase difference plate. Inthis case, the phase difference plate represents the ¼ λ plate 112, anddivides the light incident at 45° λinto x and y directions forconvenience and regards both maximum amplitudes as 1 as shown in FIG.28. An axis of abscissa indicates an angle and an axis of ordinateindicates an amplitude, and the relationship between a wavelength and aphase is such that one wavelength is 360° (λ). If the delay axis of thephase difference plate is set to the y direction, the presence of thephase difference plate causes the light transmitted through the phasedifference plate to be delayed by a ¼ λ phase in only the y direction.

The case in which the light advances by ¾ wavelength through the ¼ λplate 112 will be supposed. The light is not delayed in the x directionand is delayed by ¼ λ in the y direction as shown in a solid line from awaveform shown in a one-dotted chain line. Therefore, a point A (−1, 0)is obtained in FIGS. 28 and 29. Moreover, when the light furtheradvances by ¼ λ, a point B (0, 1) is obtained in FIGS. 28 and 29 in thesame manner.

When a time further passes as shown in FIG. 29, the light advances froma point C (1, 0) to a point D (0, −1) in the same manner. Therefore, thelight passing through the ¼ λ0 plate 112 is converted from linearpolarized light into circular polarized light as shown in FIGS. 27 and29.

The light thus circularly polarized is reflected by the surfaces of amiddle frame 113 and a solar cell 114, and is incident on the ¼λ plate112 again reversely to a direction of advance as shown in FIG. 27. Inthe same manner as described above, the light is converted into lighthaving an oscillation plane in a direction perpendicular to thedirection of incidence on the ¼ λ plate 112 and the light thus obtainedis vertical to the transmission axis of the linear polarizing plate 111.Therefore, the light cannot pass through the linear polarizing plate 111so that reflected light is blocked.

The linear polarizing plate 111 and the ¼ λ plate. 112 are combined toconstitute a circular polarizing plate.

In this case, it has been known that the incident light is reflected byapproximately several % per boundary surface if the boundary surfaceshaving different refractive indices are generally present. In the caseof air and a glass, the incident light is reflected by approximately 4%.Therefore, it is preferable that the number of boundary surfaces shouldbe decreased as greatly as possible. Accordingly, it is preferable thatthe linear polarizing plate 111 and the ¼ λ plate 112 should be stackedin a close contact state or should be bonded with an adhesive or a glue.

While the linear polarizing plate 111, the ¼ λ plate 112 and the middleframe 113 are square-shaped and the solar cell 114 is circular in FIG.27, various other shapes may be used corresponding to design.

First Embodiment

The explanation of function of circular polarizing has been completedand a first embodiment will be described below in detail with referenceto FIG. 1.

As shown in FIG. 1, a watch having a solar cell comprises a solar cell13 electrically connected to a module 14, and a minute hand 17 and anhour hand 16 which are fixed to a central shaft 15. A circularpolarizing plate A including a linear polarizing plate 11 and a ¼ λplate 12 is provided between the hands 16 and 17 and the solar cell 13.

With such a structure, a solar cell element dividing line of the solarcell 13 cannot be seen through the circular polarizing plate constitutedby the linear polarizing plate 11 and the ¼ λ plate 12. Moreover, sincereflected light is eliminated, the color of the surface of the linearpolarizing plate 11 is deepened so that a feeling of high quality can beobtained as goods.

In the present embodiment, marking such as a numeral is directly givento the linear polarizing plate 11 by means of printing to provide afunction as a solar display board.

Moreover, it is desirable that the circular polarizing plate Aconstituted by the linear polarizing plate 11 and the ¼ λ plate 12should have a plane direction positioned by an outer case which is notshown in respect of a watch assembling work. In the followingembodiments, since effects are not affected, the description of theminute and hour hands will be omitted if there is no special condition.

In the same manner as in the following embodiments, while components areshown to be separated from each other for convenience of description inthe drawings, they are actually incorporated in a close contact state,for example, properly in a state of adhesion, bonding and welding withan adhesive, a glue or the like.

Second Embodiment

As shown in FIG. 2, a circular polarizing plate A including a linearpolarizing plate 22 and a ¼ λ plate 23 is provided between a solar cell24 and a solar display board 21 having a light transmittance.

Consequently, a solar cell element dividing line of the solar cell 24cannot be seen through the solar display board 21 so that a variation indesign of the solar display board 21 is increased. Furthermore, thecolor of the solar display board 21 is deepened so that a feeling ofhigh quality can be obtained as goods.

In a work for assembling a watch, first of all, a module 25 isfabricated and the external shapes of the solar display hoard 21, thesolar cell 24, the linear polarizing plate 22 and the ¼ λ plate 23 aresimultaneously processed through press molding or the like and they aresuperposed with a structure shown in FIG. 2 in an outer case which isnot shown so that a finished watch is obtained. Accordingly, it isdesirable that the circular polarizing plate constituted by the solardisplay board 21, the solar cell 24, the linear polarizing plate 22 andthe ¼ λ plate 23 should have the same external shapes.

Third Embodiment

In the present embodiment, FIG. 3 shows a structure of a watch in whicha module 34 having a solar cell 33 is fixed into an outer case 39through a middle frame 35.

A circular polarizing plate A constituted by a linear polarizing plate31 and a ¼ λ plate 32 is provided above the middle frame 35 between aminute hand 37 and an hour hand 36 which are fixed to a central shaft 38and the solar cell 33.

By such a structure, a boundary line between the solar cell 33 and themiddle frame 35, a gate track generated through injection molding of themiddle frame 35, and furthermore, a solar cell element dividing line ofthe solar cell 33 cannot be seen through the circular polarizing plate Aconstituted by the linear polarizing plate 31 and the ¼λ plate 32.

Moreover, it is desirable that the circular polarizing plate A should beprovided to cover the solar cell 33 and the middle frame 35 as shown.

Since reflected light is eliminated, the color of the surface of thelinear polarizing plate 31 is deepened so that a feeling of high qualitycan be obtained as goods. In the present embodiment, marking such as anumeral is directly given to the linear polarizing plate 31 by means ofprinting to provide a function as a solar display board. Moreover, themiddle frame 35 is provided. Therefore, various external shapes of thewatch can be obtained in respect of design. In the followingembodiments, since effects are not affected, the description of theouter case will be omitted.

Fourth Embodiment

Also in the present embodiment, FIG. 4 shows a structure of a watch inwhich a module 45 having a solar cell 44 is fixed through a middle frame46 into an outer case which is not shown.

In the present embodiment, a circular polarizing plate A constituted bya linear polarizing plate 42 and a ¼ λ plate 43 is provided between themiddle frame 46 and a solar display board 41.

By such a structure, a boundary line between the solar cell 44 and themiddle frame 46, a gate track generated through injection molding of themiddle frame 46, and furthermore, a solar cell element dividing line ofthe solar cell 44 cannot be seen through the solar display board 41 sothat a variation in design of the solar display board 41 can beincreased. Furthermore, the color of the solar display board 41 isdeepened so that a feeling of high quality can be obtained as goods.Moreover, the middle frame 46 is provided. Therefore, various externalshapes of the watch can be obtained in respect of design.

In the present embodiment, furthermore, a color display board includinga dye, a pigment and the like is used for the solar display board 41,for example. There fore, although a tone has only a black color in thethird embodiment, the display board can have colors. Thus, it isapparent that practical use can be enhanced considerably in respect ofthe design.

Moreover, it is desirable that the circular polarizing plate Aconstituted by the linear polarizing plate 42 and the ¼ λ plate 43, themiddle frame 46 and the solar display board 41 should have the sameexternal shapes in respect of an assembling work.

Fifth Embodiment

Also in the present embodiment, FIG. 5 shows a structure of a watch inwhich a module 56 having a solar cell 55 is fixed through a middle frame57 into an outer case which is not shown.

In the present embodiment, a circular polarizing plate B having a linearpolarizing plate 52, a ¼ λ plate 53 and a ½ λ plate 54 stacked is used.The circular polarizing plate B is provided between the middle frame 57and a solar display board 51.

With such a structure, the same effects as those in the fourthembodiment can be obtained. It has been known that the provision of the½ λ plate 54 can enlarge a wavelength region in which light can beblocked and a wideband type circular polarizing plate can be obtained.In the same manner as the ¼ λ plate, the ½ λ plate includes a delay axisand has the function of delaying light incident in that direction by ½λ.

Sixth Embodiment

As shown in FIG. 6, a solar display board 61, a linear polarizing plate62 and a ¼ λ plate 63 are bonded through an adhesive layer 68 and arethen pressurized and molded. Thus, a circular polarizing plate integraltype solar display board C is fabricated.

The circular polarizing plate integral type solar display board C isprovided above a solar cell 64 having a diffusion layer 67 preformed onan upper surface thereof.

Also in this case, similarly, a boundary line between the solar cell 64and a middle frame 66, a gate track generated through injection moldingof the middle frame 66, and furthermore, a solar cell element dividingline of the solar cell 64 cannot be seen through the solar display board61. As a result, a variation in design of the solar display board 61 canbe increased. Furthermore, the color of the solar display board 61 isdeepened so that a feeling of high quality can be obtained as goods.Moreover, the middle frame 66 is provided. Therefore, various externalshapes of the watch can be obtained in respect of design

In general, it has been known that incident light is reflected byapproximately several % for each of boundary surfaces having differentrefractive indices. In the case of air and a glass, the incident lightis reflected by approximately 4%. Therefore, it is preferable that thenumber of boundary surfaces should be decreased as greatly as possible.By application to the present embodiment, when two film materials, thatis, the linear polarizing plate 62 and the ¼ λ plate 63 are insertedbetween the solar display board 61 and the solar cell 64 having thediffusion layer 67 formed thereon, the number of boundary surfaces isincreased through the insertion of the films so that light transmittedto the solar cell 64 is decreased.

However, when the solar display board 61 and the linear polarizing plate62, and the linear polarizing plate 62 and the ¼ λ plate 63 are bondedthrough an adhesive layer 68 respectively as in the present embodiment,the number of boundary surfaces is decreased from 7 to 3. As a result,the light transmitted to the solar cell 64 can be more enhanced and apower generation efficiency can be more improved as compared with thecase in which the adhesive layer 68 is not provided.

In order to carry out accommodation in an outer case which is not shown,moreover, an external shape processing is required and a perforationprocessing for penetrating with a central shaft which is not shown isalso required. If three layers are bonded by adhesive layers, theprocessing is carried out only once so that the steps can be simplifiedand a cost can be reduced. As compared with the case in which the threelayers are processed separately, furthermore, it is possible to preventa shift when the three layers are bonded. Consequently, the quality ofdesign can also be enhanced.

Furthermore, referring to a work for assembling a watch according to thepresent embodiment, the diffusion layer 67 is first formed on thesurface of the solar cell 64, is bonded to a module 65 and is thenfitted in the middle frame 66. At the same time, the solar display board61, the linear polarizing plate 62 and the ¼ λ plate 63 are bondedtogether through the adhesive layer 68, and the external shape andperforation processings are then carried out through a press or thelike. As shown, subsequently, they are superposed on an outer case whichis not shown. Thus, a finished watch is obtained.

In the present embodiment, since the solar display board 61, the linearpolarizing plate 62 and the ¼ λ plate 63 are bonded through the adhesivelayer 68, they can be treated as one member. Thus, the work forassembling a watch can be carried out most easily in the embodiments.

Seventh Embodiment

As shown in FIG. 7, a solar display board 71, a linear polarizing plate72, a ¼ λ plate 73, a solar cell 74 and a middle frame 76 are stacked asshown and are bonded with an adhesive layer 77.

Also in this case, in the same manner as in the sixth embodiment, aboundary line between the solar cell 74 and the middle frame 76, agatetrack generated through injection molding of the middle frame 76, andfurthermore, a solar cell element dividing line of the solar cell 74cannot be seen through the solar display board 71 so that a variation indesign of the solar display board 71 can be increased.

Furthermore, the color of the solar display board 71 is deepened so thata feeling of high quality can be obtained as goods.

Moreover, the middle frame 76 is provided. Therefore, various externalshapes of the watch can be obtained in respect of the design.

Also in the present embodiment, in the same manner as in the sixthembodiment, the number of boundary surfaces provided between the solardisplay board 71 and the air is one and a transmittance can be moreenhanced than that in the sixth embodiment and a power generationefficiency can also be improved.

Eighth Embodiment

In the present embodiment, a solar cell 83 is larger than the externalshape of a module 84 and the external shape of a middle frame 85 forfixing the module 84 to an outer case which is not shown is equal tothat of the solar cell 83.

In the present embodiment, the solar cell 83 wholly covers a boundaryline between the middle frame 85 and the module 84 and a gate trackgenerated through injection molding of the middle frame 85. Therefore,the quality of display is not reduced. By inserting a linear polarizingplate 81 and a ¼ λ plate, a solar cell element dividing line of thesolar cell 83 can be prevented from being seen.

Ninth Embodiment

The present embodiment provides a watch structure in which a solar cell94 and a module 95 are fixed through a middle frame 96 to an outer casewhich is not shown.

Then, a circular polarizing plate A constituted by a linear polarizingplate 92 and a ¼ λ plate 93 is provided above the middle frame 96.Furthermore, an LCD panel 91 is provided thereabove.

The LCD panel 91 having a smaller external shape than that of the solarcell 94 is provided above the circular polarizing plate A. Consequently,light transmitted through the linear polarizing plate 92 and the ¼ λplate 93 reaches the solar cell 94, and power is supplied to the LCDpanel to display a time by electromotive force of the solar cell 94.

Also in the present embodiment, in the same manner as in the seventhembodiment, a boundary line between the solar cell 94 and the middleframe 96, a gate track generated through injection molding of the middleframe 96, and furthermore, a solar cell element dividing line of thesolar cell 94 cannot be seen so that a variation in design can beincreased and a feeling of high quality can be obtained as goods in thepresent embodiment, the LCD panel displays a time of 12 o'clock in theafternoon.

Tenth Embodiment

A linear polarizing plate has an absorption type and a reflection typeIn the present embodiment, a reflection type linear polarizing platehaving a reflection axis orthogonal to a transmission axis is used.

In the case where a circular polarizing plate is constituted by thereflection type linear polarizing plate and a ¼ λ plate and is insertedbetween a solar display board and a solar cell, a reflection type linearpolarizing plate 42′ is used as a linear polarizing plate 42 as inanother embodiment, for example, as shown in FIG. 10. In this case,also, a boundary line between a solar cell 44 and a middle frame 46, agate track generated through injection molding of a middle frame 46, andfurthermore, a solar cell element dividing line of a solar cell 44cannot be seen through a solar display board 41. As a result, avariation in design of the solar display board 41 can be increased inthe same manner as in the fourth embodiment.

In the case of a blue solar display board, a brightness is decreased andthe blue color of the solar display board is deepened by using theabsorption type linear polarizing plate and the blue color of the solardisplay board is reproduced faithfully by using the reflection typelinear polarizing plate. In the case of a black solar display board,moreover, a brightness is also decreased and a feeling of high qualitycan be obtained by using the absorption type linear plate and abrightness of the black color of the solar display board is increased toapproximate a gray color by using the reflection type linear polarizingplate.

As described above, the color of the solar display board is changed in adeeper direction by using the absorption type linear polarizing plate,and a feeling of high quality can be obtained visually irrespective ofthe color of the solar display board. The absorption type is differentfrom the reflection type in that an oscillation in a directionperpendicular to the transmission axis of the linear polarizing plate isabsorbed in the linear polarizing plate or is reflected from the surfaceof the linear polarizing plate. Therefore, they carry out the sameactions for transmitted light and have the same functions as thecircular polarizing plates.

Eleventh Embodiment

As shown in FIG. 11, a diffusion layer 47 is formed between the solardisplay board 41 and the linear polarizing plate 42 in the structure ofFIG. 4.

By such a structure, a boundary line between the solar cell 44 and themiddle frame 46, a gate track generated through injection molding of themiddle frame 46, and furthermore, a solar cell element dividing line ofthe solar cell 44 cannot be seen more than those in the fourthembodiment so that a variation in design of the solar display board 41can be increased.

Furthermore, the color of the solar display board 41 is deepened and afeeling of high quality can be obtained as goods. Moreover, the middleframe is provided. Therefore, various external shapes of a watch can beobtained in respect of the design.

In the present embodiment, when the solar display board 41 is subjectedto injection molding, concavo-convex shapes previously formed in a moldare transferred on to a surface opposed to the linear polarizing plate42 of the solar display board 41 so that a diffusion layer is formed.

As described in the Background of the invention, the simple formation ofthe diffusion layer is not sufficient. By thus using a circularpolarizing plate together, the above-mentioned effects can be produced.

Twelfth Embodiment

As shown in FIG. 12, a diffusion layer 48 is formed between the linearpolarizing plate 42 and the ¼ λ plate 43 in the structure of FIG. 4.

Consequently, a boundary line between the solar cell 44 and the middleframe 46, a gate track generated through injection molding of the middleframe 46, and furthermore, a solar cell element dividing line of thesolar cell 44 cannot be seen more than those in the fourth embodiment sothat a variation in design of the solar display board 41 can further beincreased.

Furthermore, the color of the solar display board 41 is deepened and afeeling of high quality can be obtained as goods. Moreover, the middleframe is provided. Therefore, various external shapes of a watch can beobtained in respect of the design.

In the present embodiment, oxide particulates are dispersed into anadhesive layer between the linear polarizing plate 42 and the ¼λ plate43 so that the diffusion layer is formed.

Thirteenth Embodiment

As shown in FIG. 13, in a watch structure 100 according to the presentembodiment, a solar cell 102 and a module 104 are fixed through a middleframe 106 to an outer case which is not shown.

A circular polarizing plate A constituted by a linear polarizing plate101 and a ¼ λ plate 103 is provided above the middle frame 106.Furthermore, a solar display board 108 is provided thereabove.

As shown in FIG. 14, the solar display board 108 is constituted by aresin substrate body 110 and a pattern portion 112 formed on an uppersurface thereof.

It is preferable that the resin substrate 110 should be formed of athermoplastic resin, and furthermore, a resin selected from the groupconsisting of polyvinyl chloride, an acryl resin and polycarbonate. Inthe present invention, it is particularly preferable that the acrylresin or the polycarbonate should be used. A thickness of the resinsubstrate 110 is preferably approximately 50 to 500 μm, and morepreferably approximately 80 to 200 μm. The resin substrate 11 may betransparent or be colored and translucent.

A pattern is given to the resin substrate 110 by an injection moldingmethod for injection molding a resin in a mold having a pattern formedthereon (which will be hereinafter referred to as a “pattern mold”); apattern transfer method for transferring a pattern onto a resinsubstrate through a thermal press using the pattern mold; or a machiningmethod using engraving, rubbing or the like. In the present invention,particularly, the pattern transfer method is preferably employed.

As a method of giving a pattern to the resin substrate 110, the patterntransfer method will be described below.

As shown in FIGS. 15(A) to 15(C), the pattern transfer method comprisesthe steps of manufacturing an electric mold 120 having a pattern surfaceand of thermally pressing a pattern surface 122 molded in the electricmold 120 against the resin substrate 110.

When the electric mold 120 having the pattern surface is to bemanufactured, a surface pattern of an article 124 having a pattern isfirst molded through an electric molding method. More specifically, thearticle 124 having the pattern is subjected to electroforming. In thecase in which the article 124 does not have a conductivity, a metal film126 is formed on the surface of the article 124 to give a conductivityto the article 124.

Examples of the article 124 having the pattern include a cloth, a paper,a rift, a grain, a pyroxene, a leaf, a petal, a shell, a leather,artificial substances having various fine patterns (an artificialleather, engraving, chasing) and the like. It is preferable that thecloth, the paper, the rift, the grain, the pyroxene, the leaf, theengraving and the chasing should be used.

As shown in FIG. 15(A), a pattern is formed on the surface of thearticle 124 (concavo-convex portions on the surface in FIG. 15(A)). InFIG. 2, the back face of the article 124 is omitted.

In order to give a conductivity to the surface of the article 124, thesurface of the article 124 is first cleaned and a metal film 126 is thenformed on the surface of the article 124. The metal film 126 is formedby vacuum evaporation, ion plating, sputtering, nonelectrolytic plating,silver mirror reaction or the like, for example. While the metal film126 is formed of a metal such as silver or gold or their alloy and athickness thereof is not particularly restricted, a thickness ofapproximately 1 to 30 μm, preferably approximately 1 to 10 μm issuitable.

In the case in which the article 124 has a conductivity as describedabove, it is not necessary to form the metal film 126.

Next, the surface of the metal film 126 is subjected to removal ifnecessary. When the article 124 has a conductivity, the surface of thearticle 124 is directly subjected to the removal.

The removal can be carried out through injection of selenious acid. Whenthe removal is carried out, the electric mold 120 can easily be removed.

As shown in FIG. 15(B), next, a metal is deposited on the surface of thearticle 124 or the surface of the metal film 126 through the electricmolding (electroforming) to form the electric mold 120.

As a material of the electric mold 120, a metal such as nickel, copperor iron or their alloy is preferably used.

A thickness of the electric mold 120 is 100 to 300 μm, preferably 100 to250 μm, and more preferably 100 to 200 μm. If the thickness of theelectric mold 120 is set in such a range, the resin substrate 110 is notdeformed and heat transfer can be carried out well during a thermalpress.

The conditions of the electric molding are not particularly restrictedbut are properly selected from conventional electric molding (plating)conditions. There will be briefly described the electric moldingconditions for obtaining the electric mold 120 having a thickness of 200μm by using a nickel metal. However, the conditions should not berestricted by such a condition.

As a pretreatment, the surface of the article 124 having a pattern orthe metal film 126 is subjected to treatments of electrolyticdegreasing, washing, acid neutralization, washing, removal (potassiumdichromate) and washing.

Next, the electroforming is carried out at 265 AH (IA/dm²) at a liquidtemperature of 50° C. by using a nickel plating bath (450 g/liter ofnickel sulfamate, 40 g/liter of boric acid). Consequently, the electricmold 120 having a thickness of 200 μm is obtained.

As shown in FIG. 15(C), next, the electric mold 120 is removed from thesurface of the article 124 or the surface of the metal film 126.Consequently, the electric mold 120 having a molded pattern surface isobtained. The electric mold 120 thus obtained is cut out correspondingto the shape of a display board to be intended if necessary.

As shown in FIG. 16, subsequently, the molded pattern is transferredonto the resin substrate 110.

In order to transfer the pattern onto the resin substrate 110, themolded pattern surface of the electric mold 12 opposed to the resinsubstrate 110 and are thermally pressed between a pair of upper andlower thermal presses 130 and 132.

While the conditions of the thermal press are varied depending on thematerial and thickness of the resin substrate 110, a thermal presstemperature is generally set in the vicinity of a melting temperature ofa resin, specifically, approximately 90 to 180° C. is suitable. Inparticular, it is preferable that a temperature on the electric moldside should be set to 120 to 140° C. and a temperature of a resinsubstrate should be set to approximately 40 to 80° C. in a thermal pressmachine. A thermal press pressure is suitably set to approximately 20 to100 kb/cm². Moreover, it is preferable that the time required for thethermal press should be set to approximately 10 to 180 seconds.

Prior to the thermal press of the resin substrate 110, preheating iscarried out so that the time required for the thermal press can beshortened and productivity can be enhanced. It is preferable that apreheating temperature should be set to approximately 40 to 80° C. Ifsuch a preheating treatment is carried out, the time required for thethermal press can be shortened to approximately 10 to 30 seconds.

Moreover, the electric mold 120 may be bonded to a thermal press headduring the thermal press. Consequently, the resin substrate 110 and theelectric mold 120 can easily be removed from each other after thethermal press so that the productivity can be enhanced.

By the thermal press, the molded pattern 122 of the electric mold 120 istransferred onto the resin substrate 110 and the electric mold 120 isremoved. Consequently, the resin substrate 110 having a pattern can beobtained.

Furthermore, it is also possible to manufacture a transparent resin filmhaving a pattern on both surfaces by thermally pressing the patternsurface of the electric mold 120 against both surfaces of the resinsubstrate 110 at the same time or successively.

In the case in which the thermal press is to be carried out over bothsurfaces at the same time, it is preferable that the electric mold 120should be fixed to the upper and lower thermal press heads. In the casein which the thermal press is to be successively carried out over bothsurfaces, moreover, it is preferable that the thermal press should beperformed over one of the surfaces, the resin substrate 110 should bethen turned over and the thermal press should be performed over theother surface.

The resin substrate 110 having a pattern is manufactured independentlyone by one in the method of manufacturing the resin substrate 110 havinga pattern described above. However, it is also possible to obtain theresin substrate 110 having a pat tern by producing the electric mold 120having a plurality of patterns, thermally pressing the electric mold 120against a plastic film, producing the resin substrate 110 having aplurality of pattern portions and cutting out the shape of a displayboard for each pattern.

The resin substrate 110 having a pattern thus constituted is stacked ina close contact state over the upper surface of the circular polarizingplate A constituted by the linear polarizing plate 101 and the ¼ λ plate103. Alternatively, the resin substrate 110 is integrated by means ofbonding using an adhesive, bonding using a glue, film bonding, meltingbonding, high frequency bonding or the like, for example.

A pattern may be transferred onto the resin substrate 110 before orafter the bonding of the resin substrate 110 and the circular polarizingplate A.

After the molded pattern of the electric mold 120 is thus transferredonto the resin substrate 110 through the thermal press, the patterntransfer onto the resin substrate 110 and the integration with thecircular polarizing plate A can also be carried out simultaneously byusing the thermal press as shown in FIG. 17, instead of stacking theresin substrate 110 on the upper surface of the circular polarizingplate A constituted by the linear polarizing plate 101 and the ¼ λ plate103 or integrating the resin substrate 110 there with.

More specifically, as shown in FIG. 17, the circular polarizing plate Aconstituted by the linear polarizing plate 101 and the ¼ λ plate 103,the resin substrate 110 and the electric mold 120 are provided betweenthe pair of upper and lower thermal presses 130 and 132 in order.Thereafter, the pattern 122 of the electric mold 120 is transferred ontothe upper surface of the resin substrate 110 by a thermal press at atime and the resin substrate 110 is welded and integrated with thecircular polarizing plate A, through the heating of the thermal press.

In this case, it is desirable that an adhesive should be interposedbetween the resin substrate 110 and the circular polarizing plate A,because the integration can easily be carried out, which is not shown.

By such a method, the pattern 122 of the electric mold 120 istransferred onto the upper surface of the resin substrate 110 throughthe one-time thermal press and the resin substrate 110 is integratedwith the circular polarizing plate A through the heating of the thermalpress. Therefore, a working efficiency can be very enhanced.

With such a structure, a boundary line between the solar cell 102 andthe middle frame 106, agate track generated through injection molding ofthe middle frame 106, and furthermore, a solar cell element dividingline of the solar cell 102 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 108 can further be increased.

Furthermore, a cloth, a paper, a rift, a grain, a pyroxene, a leaf, apetal, a shell, a leather and various fine patterns to be the patternportion 112 of the resin substrate 110 are transferred onto the uppersurface of the solar display board 108. Consequently, a feeling of highquality of the solar display board 108 can be produced. In addition, itis possible to increase a variation in design in which a decorativeproperty is great and the depth of a pattern and a three-dimensionaleffect are excellent. Thus, the feeling of high quality can be producedas goods. Moreover, the middle frame is provided. Therefore, variousexternal shapes of the watch can be obtained in respect of the design.

Fourteenth Embodiment

As shown in FIG. 18, in a watch structure 140 according to the presentembodiment, a solar cell 142 and a module 144 are fixed through a middleframe 146 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate141 and a ¼ λ plate 143 is provided above the middle frame 146.Furthermore, a solar display board 148 is provided thereabove.

The solar display board 148 according to the present embodiment includesa resin substrate 150 having a pattern and a decorating thin film member152.

Since the material and fabricating method for the resin substrate 150having a pattern are the same as those in the thirteenth embodiment,detailed description thereof will be omitted.

The decorating thin film member 152 is not particularly restricted butmay be any of various thin layer articles having a pattern, coloring orthe like. Examples of the decorating thin film member 152 include a thinlayer article formed of a natural material such as a cloth, a paper, athinly sliced shell or a wood, a ceramic sheet, a polarizing film, acoloring film, an electroforming foil, an electrodeposited image, anetched metal foil (etched image), a film on which a hologram is printedout (a hologram image) and the like. The thickness of the decoratingthin film member 152 is preferably approximately 5 to 300 μm, and morepreferably approximately 10 to 200 μm.

The resin substrate 150 is bonded to the decorating thin film member 152through, for example, adhesion using an adhesive, bonding using a glue,film bonding, melting bonding, high frequency bonding or the like.

In this case, the whole thickness of the display board 148 including theresin substrate 150 and the decorating thin film member 152 is notparticularly restricted but is preferably 60 to 800 μm, and morepreferably 300 to 500 μm.

The display board according to the present invention, moreover, it isdesirable that a light transmittance (a visible light range orwavelength: 600 nm) should be 10% or more, preferably 20% or more, andmore preferably 30% or more by proper selection of the material and thethickness. A display board having such a light transmittance can bepreferably used as a clock dial of a solar charging driving type whichhas recently spread in the market. This is the same as in the followingembodiments.

With such a structure, a boundary line between the solar cell 142 andthe middle frame 146, a gate track generated through injection moldingof the middle frame 146, and furthermore, a solar cell element dividingline of the solar cell 142 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 148 can further be increased.

Furthermore, a decoration which is present on the upper surface of thesolar display board 148 such as a cloth, a paper, a rift, a grain, apyroxene, a leaf, a petal, a shell, a leather and various transferredfine patterns to be the pattern portion 152 of the resin substrate 150and a decoration which is present thereunder, for example, a thin layerarticle formed of a natural material such as a cloth, a paper, a shellor a wood of the decorating thin film member 152, a polarizing film, acoloring film, an electroforming foil or an electrodeposited imageproduce a decorative property. Therefore, the design having athree-dimensional effect and a feeling of high quality can beimplemented.

Consequently, the feeling of high quality of the solar display board 148can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Fifteenth Embodiment

As shown in FIG. 19, in a watch structure 160 according to the presentembodiment, a solar cell 162 and a module 164 are fixed through a middleframe 166 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate161 and a ¼ λ plate 163 is provided above the middle frame 166.Furthermore, a solar display board 168 is provided thereabove.

The solar display board 168 according to the present embodiment has afirst resin substrate 170, a decorating thin film member 172 and asecond resin substrate 174 provided in this order.

The first resin substrate 170 and the second resin substrate 174 areformed of the same material as that of the resin substrate 110 of thedisplay board 108 according to the thirteenth embodiment.

In the solar display board 168 according to the present embodiment, itis not necessary to form a pattern on the first resin substrate 170 andthe second resin substrate 174. However, the pattern may be formed oneither or both of them in the same manner as the resin substrate 110 ofthe display board 108 according to the thirteenth embodiment. In thiscase, the same method as that described in the thirteenth embodiment canbe employed for forming the pattern, and preferably, a pattern transfermethod using a thermal press by means of a pattern mold can be employed.

Moreover, the decorating thin film member 172 is the same as thedecorating thin film member 152 according to the fourteenth embodiment.

Furthermore, it is desirable that the decorating thin film member 172should be provided between the first resin substrate 170 and the secondresin substrate 174 through one of adhesion using an adhesive, bondingusing a glue, film bonding, bonding using an adhesive, melting bondingand high frequency bonding in consideration of a mechanical strength, aremoving property and a transmittance.

A thickness of the first resin substrate 170 in the solar display board168 is preferably 50 to 500 μm, and more preferably 80 to 200 μm. Athickness of the decorating thin film member 172 is preferably 5 to 300μm, and more preferably 10 to 200 μm. A thickness of the second resinsubstrate 174 is preferably 50 to 500 μm, and more preferably 80 to 200μm.

A whole thickness of the solar display board 168 including the resinsubstrates 170 and 174 and the decorating thin film member 172 is notparticularly restricted but is preferably 110 to 1300 μm, and morepreferably 300 to 500 μm.

With such a structure, a boundary line between the solar cell 162 andthe middle frame 166, agate track generated through injection molding ofthe middle frame 166, and furthermore, a solar cell element dividingline of the solar cell 162 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 168 can further be increased.

Furthermore, a decoration which is present on the upper or lower surfaceof the solar display board 168 such as a cloth, a paper, a rift, agrain, a pyroxene, a leaf, a petal, a shell, a leather and varioustransferred fine patterns to be the pattern portion of the first resinsubstrate 170 or the second resin substrate 174 and a decoration whichis present in the middle thereof, for example, a thin layer articleformed of a natural material such as a cloth, a paper, a shell or a woodof the decorating thin film member 172, a polarizing film, a coloringfilm, an electro forming foil or an electrode posited image produce adecorative property. As a result, the design having a three-dimensionaleffect and a feeling of high quality can be attained.

Consequently, the feeling of high quality of the solar display board 168can be produced. In addition, it is possible to increase a variation indesign in which the depth of a pattern and a three-dimensional effectare excellent. Thus, the feeling of high quality can be produced asgoods. Moreover, the middle frame is provided. Therefore, variousexternal shapes of the watch can be obtained in respect of the design.

Sixteenth Embodiment

As shown in FIG. 20, in a watch structure 180 according to the presentembodiment, a solar cell 182 and a module 184 are fixed through a middleframe 186 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate181 and a ¼ λ plate 183 is provided above the middle frame 186.Furthermore, a solar display board 188 is provided thereabove.

The solar display board 188 according to the present embodiment has aninorganic substrate 190 having a pattern and a decorating thin filmmember 192 fixed to the inorganic substrate.

The inorganic substrate 190 is formed of a glass, a sapphire glass or aceramic plate, and preferably the glass or the sapphire glass. Theinorganic substrate 190 may be transparent or may be colored andtranslucent. A pattern is formed on the inorganic substrate 190 throughmachining such as engraving or rubbing, etching using hydrofluoric acid,the electric forming method and the pattern transfer method using athermal press described in the thirteenth embodiment or the like.Moreover, the decorating thin film member 192 may be the same as thedecorating thin film member 192 according to the fourteenth embodiment.

A thickness of the inorganic substrate 190 in the solar display board188 is preferably 50 to 500 μm, and more preferably 200 to 300 μm. Athickness of the decorating thin film member 192 is preferably 5 to 300μm, and more preferably 10 to 200 μm.

A whole thickness of the solar display board 188 including the inorganicsubstrates 190 and the decorating thin film member 192 is notparticularly restricted but is preferably 60 to 800 μm, and morepreferably 300 to 600 μm.

In this case, it is desirable that the inorganic substrate 190 and thedecorating thin film member 192 should be fixed by one of adhesion usingan adhesive, bonding using a glue, film bonding, bonding using anadhesive, melting bonding and high frequency bonding in consideration ofa mechanical strength, a removing property and a transmittance.

With such a structure, a boundary line between the solar cell 182 andthe middle frame 186, agate track generated through injection molding ofthe middle frame 186, and furthermore, a solar cell element dividingline of the solar cell 182 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 188 can further be increased.

Furthermore, the pattern portion of the inorganic substrate 190 presenton the upper surface of the solar display board 188 and a decorationwhich is present thereunder, for example, a thin layer article formed ofa natural material such as a cloth, a paper, a shell or a wood of thedecorating thin film member 192, a polarizing film, a coloring film, anelectroforming foil or an electrodeposited image produce a decorativeproperty. Therefore, the design having a three-dimensional effect and afeeling of high quality can be implemented.

Consequently, the feeling of high quality of the solar display board 188can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Seventeenth Embodiment

As shown in FIG. 21, in a watch structure 200 according to the presentembodiment, a solar cell 202 and a module 204 are fixed through a middleframe 206 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate201 and a ¼ λ plate 203 is provided above the middle frame 206.Furthermore, a solar display board 208 is provided thereabove.

The solar display board 208 according to the present embodiment isconstituted by stacking an inorganic substrate 210 and a resin substrate212.

In this case, the materials of the inorganic substrate 210 and the resinsubstrate 212 are the same as those of the inorganic substrate 190according to the sixteenth embodiment and the resin substrate 110according to the thirteenth embodiment, respectively. In the solardisplay board 208, a pattern does not need to be formed on the inorganicsubstrate 210 and the resin substrate 212 and a pattern may be formed oneither or both of them. In particular, it is preferable that the patternshould be formed on the resin substrate 212 by using a pattern transfermethod.

A thickness of the inorganic substrate 210 in the solar display board208 is preferably 50 to 500 μm, and more preferably 200 to 300 μm. Athickness of the resin substrate 212 is preferably 50 to 500 μm, andmore preferably 100 to 200 μm.

A whole thickness of the solar display board 208 including the inorganicsubstrate 210 and the resin substrate 212 is not particularly restrictedbut is preferably 100 to 1000 μm, and more preferably 300 to 600 μm.

It is desirable that the resin substrate 212 and the inorganic substrate210 should be fixed through one of adhesion using an adhesive, bondingusing a glue, film bonding, bonding using an adhesive, melting bondingand high frequency bonding in consideration of a mechanical strength, aremoving property and a transmittance.

With such a structure, a boundary line between the solar cell 202 andthe middle frame 206, a gate track generated through injection moldingof the middle frame 206, and furthermore, a solar cell element dividingline of the solar cell 202 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 208 can further be increased.

Furthermore, the pattern portion of the inorganic substrate 210 presenton the upper surface of the solar display board 208 and a decorationwhich is present thereunder and is the pattern portion of the resinsubstrate 212 such as a cloth, a paper, a rift, a grain, a pyroxene, aleaf, a petal, a shell, a leather and various transferred fine patternsproduce a decorative property. As a result, the design having athree-dimensional effect and a feeling of high quality can beimplemented.

Consequently, the feeling of high quality of the solar display board 208can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Eighteenth Embodiment

As shown in FIG. 22, in a watch structure 220 according to the presentembodiment, a solar cell 222 and a module 224 are fixed through a middleframe 226 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate221 and a ¼ λ plate 223 is provided above the middle frame 226.Furthermore, a solar display board 228 is provided thereabove.

The solar display board 228 according to the present embodiment isformed of only the inorganic substrate 230.

In this case, it is desirable that the material of the in organicsubstrate 230 should be the same as that of the in organic substrate 190according to the sixteenth embodiment and should be colored with apigment or a dye.

In the solar display board 228, moreover, a pattern does not need to beformed on the inorganic substrate 203 but is preferably formed.

A whole thickness of the solar display board 228 is not particularlyrestricted but is preferably 100 to 1000 μm, and more preferably 300 to600 μm.

With such a structure, a boundary line between the solar cell 222 andthe middle frame 226, agate track generated through injection molding ofthe middle frame 226, and furthermore, a solar cell element dividingline of the solar cell 222 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 228 can further be increased.

Furthermore, a decoration of the pattern portion of the in organicsubstrate 230 present on the upper surface of the solar display board228 produces a decorative property so that the design having athree-dimensional effect and a feeling of high quality can beimplemented.

Consequently, the feeling of high quality of the solar display board 228can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Nineteenth Embodiment

As shown in FIG. 23, in a watch structure 240 according to the presentembodiment, a solar cell 242 and a module 244 are fixed through a middleframe 246 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate241 and a ¼λ plate 243 is provided above the middle frame 246.Furthermore, a solar display board 248 is provided thereabove.

The solar display board 248 according to the present embodiment isformed by stacking a first inorganic substrate 250, a decorating thinfilm member 252 and a second inorganic substrate 254.

The first inorganic substrate 250 and the second inorganic substrate 254can be the same as the inorganic substrate 190 according to thesixteenth embodiment.

In the solar display board 248, a pattern does not need to be formed onthe first inorganic substrate 250 and the second inorganic substrate 254but is desirably formed on either or both of them. Moreover, thedecorating thin film member 252 can be the same as the decorating thinfilm member 152 according to the fourteenth embodiment.

A thickness of the first inorganic substrate 250 in the solar displayboard 248 is preferably 50 to 500 μm. and more preferably 200 to 300 μm.A thickness of the decorating thin film member 252 is preferably 5 to300 μm, and more preferably 10 to 200 μm. A thickness of the secondinorganic substrate 254 is preferably 50 to 500 μm, and more preferably200 to 300 μm.

A whole thickness of the solar display board 248 including the inorganicsubstrates 250 and 254 and the decorating thin film member 252 is notparticularly restricted but is preferably 110 to 1300 μm, and morepreferably 300 to 600 μm.

It is desirable that the decorating thin film member 252 should be fixedbetween the first inorganic substrate 250 and the second inorganicsubstrate 254 through one of adhesion using an adhesive, film bonding,bonding using an adhesive, melting bonding and high frequency bonding inconsideration of a mechanical strength, a removing property and atransmittance.

With such a structure, a boundary line between the solar cell 242 andthe middle frame 246, agate track generated through injection molding ofthe middle frame 246, and furthermore, a solar cell element dividingline of the solar cell 242 cannot be seen still more than those in thefourth embodiment. As a result, a variation in the design of the solardisplay board 248 can further be increased.

Furthermore, a decoration of the pattern portions of the inorganicsubstrates 250 and 254 which are present on the upper and lower surfacesof the solar display board 248 and a decoration which is present in themiddle thereof, for example, a thin layer article formed of a naturalmaterial such as a cloth, a paper, a shell or a wood, a polarizing film,a coloring film, an electroforming foil or an electrodeposited image inthe decorating thin film member 252 produce a decorative property. As aresult, the design having a three-dimensional effect and a feeling ofhigh quality can be implemented.

Consequently, the feeling of high quality of the solar display board 248can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Twentieth Embodiment

As shown in FIG. 24, in a watch structure 260 according to the presentembodiment, a solar cell 262 and a module 264 are fixed through a middleframe 266 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate261 and a ¼ plate 263 is provided above the middle frame 266.Furthermore, a solar display board 268 is provided thereabove.

The solar display board 268 according to the present embodiment isconstituted by stacking a resin substrate 270, a decorating thin filmmember 272 and an inorganic substrate 274 in this order.

In this case, the resin substrate 270, the decorating thin film member272 and the inorganic substrate 274 can be the same as the resinsubstrate 110 according to the thirteenth embodiment, the decoratingthin film member 152 according to the fourteenth embodiment and theinorganic substrate 190 according to the sixteenth embodiment,respectively.

Moreover, a pattern does not need to be formed on the resin substrate270 and the inorganic substrate 274 but is desirably formed on either orboth of them.

In this case, one or more resin substrates, decorating thin film membersand inorganic substrates may be used and may have three or more layers,respectively. Moreover, the order of the stack of the resin substrate,the decorating thin film member and the in organic substrate is notparticularly restricted. Furthermore, two or more kinds of resinsubstrates may be used. Similarly, two or more kinds of decorating thinfilm members and inorganic substrates may be used, respectively.

Such a solar display board 268 has the following preferable layerstructures including the structure shown in FIG. 24,

(1) resin substrate/decorating thin film member/resinsubstrate/inorganic substrate,

(2) resin substrate/decorating thin film member/inorganicsubstrate/resin substrate,

(3) decorating thin film member/inorganic substrate/resin substrate, and

(4) inorganic substrate/decorating thin film member/inorganicsubstrate/resin substrate.

In this case, a thickness of the resin substrate is preferably 50 to 500μm and more preferably 80 to 200 μm per layer. A thickness of thedecorating thin film member is preferably 5 to 300 μm and morepreferably 10 to 200 μm per layer. A thickness of the inorganicsubstrate is preferably 50 to 500 μm and more preferably 200 to 300 μmper layer.

A whole thickness of the solar display board 268 including the resinsubstrate, the decorating thin film member and the inorganic substrateis not particularly restricted but is preferably 110 to 1300 μm, andmore preferably 300 to 600 μm.

With such a structure, a boundary line between the solar cell 262 andthe middle frame 266, a gate track generated through injection moldingof the middle frame 266, and furthermore, a solar cell element dividingline of the solar cell 262 cannot be seen still more than those in thefourth embodiment. Therefore, a variation in the design of the solardisplay board 268 can further be increased.

Furthermore, a decoration such as a cloth, a paper, a rift, a grain, apyroxene, a leaf, a petal, a shell, a leather and various transferredfine patterns to be the pattern portion of the resin substrate 270, adecoration of the pattern portion of the inorganic substrate 274 and adecoration of the decorating thin film member 272 such as a thin layerarticle formed of a natural material, for example, a cloth, a paper, ashell or a wood, a polarizing film, a coloring film, an electroformingfoil or an electrode posited image produce a decorative property. As aresult, the design having a three-dimensional effect and a feeling ofhigh quality can be implemented.

Consequently, the feeling of high quality of the solar display board 248can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

Twenty-first Embodiment

As shown in FIG. 25, in a watch structure 280 according to the presentembodiment, a solar cell 282 and a module 284 are fixed through a middleframe 286 to an outer case which is not shown in the same manner as thatin the thirteenth embodiment.

A circular polarizing plate A constituted by a linear polarizing plate281 and a ¼ λ plate 283 is provided above the middle frame 286.Furthermore, a solar display board 288 is provided thereabove.

The solar display board 288 according to the present embodiment isconstituted by a metal plate 290.

The metal plate 290 has a window portion 292 of a display section formedin a central part thereof through machining such as punching, and apattern 294 is formed on a surface thereof.

While the metal plate 290 is not particularly restricted but a metal,for example, phosphor bronze, titanium, stainless steel such as SUS 304,a copper alloy such as brass, nickel silver or the like can be used.

As a method of forming a pattern on the surface of the metal plate 290,a pattern forming method of forming a pattern through a press using apattern mold and a machining method using engraving, rubbing or the likecan be used.

For the metal plate 290, it is also possible to use a metal thin filmhaving a pattern shape which is obtained by forming a pattern on a metalsubstrate through a photoresist, plating the pattern with a metal,forming a pattern metal thin layer, coating an adhesive on the surfaceof the metal thin film layer and removing the metal substrate.

It is desirable that the metal plate 290 should be fixed to the uppersurface of the circular polarizing plate A through bonding using a glue,film bonding, bonding using an adhesive or the like in consideration ofa mechanical strength, a removing property and a transmittance.

With such a structure, a boundary line between the solar cell 282 andthe middle frame 286, agate track generated through injection molding ofthe middle frame 286, and furthermore, a solar cell element dividingline of the solar cell 282 cannot be seen still more than those in thefourth embodiment so that a variation in the design of the solar displayboard 288 can further be increased.

Furthermore, the decorative property of the metal plate 290 which ispresent on the upper surface of the solar display board 288 canimplement the design having a three-dimensional effect and a feeling ofhigh quality.

Consequently, the feeling of high quality of the solar display board 288can be produced. In addition, it is possible to increase a variation indesign in which a decorative property is great and the depth of apattern and a three-dimensional effect are excellent. Thus, the feelingof high quality can be produced as goods. Moreover, the middle frame isprovided. Therefore, various external shapes of the watch can beobtained in respect of the design.

An auxiliary member formed of a transparent resin such as polycarbonatecan also be provided between the solar display board according to eachof the thirteenth to twenty-first embodiments and the circularpolarizing plate A to adjust a portion between the circular polarizingplate A and the solar display board to the thickness of an outer case,which is not shown.

On the surface of the solar display board according to the embodiment ofthe present invention, moreover, a display portion (a time scale of awatch), the name of a manufacturer, a type and the like can be displayedby means of printing or a decorating member (a time letter, a mark orthe like) to be fabricated by electroforming and fixed with an adhesivecan be provided.

Furthermore, while the description has been given to only the watch inthe above-mentioned embodiments, the present invention is not restrictedthereto but the same effects can be obtained, that is, a variation indesign can be increased through utilization for other electronicapparatuses having a solar cell, for example, an electronic calculator,a radio, a battery charger or the like. Thus, various changes can bemade without departing from the scope of the present invention.

According to the present invention, the circular polarizing plateconstituted by the linear polarizing plate and at least one phasedifference plate is provided between the middle frame for fixing themodule having the solar cell to the case and the solar display board.Consequently, a boundary line between the solar cell and the middleframe, a gate track generated through injection molding of the middleframe, and furthermore, a solar cell element dividing line of the solarcell cannot be seen. As a result, a variation in design of the solardisplay board can be increased. Moreover, the color of the solar displayboard is deepened so that a feeling of high quality can be obtained asgoods.

According to the present invention, furthermore, the surface of thecircular polarizing plate is provided with a solar display boardconstituted by a resin substrate having a pattern, an inorganicsubstrate having a pattern or a decorating thin film member or acombination thereof. Therefore, a decorative property is great, thepattern becomes rich and an excellent three-dimensional effect can beobtained. Through a combination of two or more patterns or two or morematerials, moreover, it is possible to manufacture a display boardhaving a better feeling of beauty than ever. Thus, a design variationcan be increased.

What is claimed is:
 1. A display device for an electronic apparatuscomprising a solar cell, and a solar cell display board for transmittinglight having a watch dial in addition to the solar cell, wherein acircular polarizing plate for transmitting light is provided between thesolar cell and the solar display board.
 2. The display device for anelectronic apparatus according to claim 1, wherein the solar cell, thesolar cell display board and the circular polarizing plate haveidentical outer shapes.
 3. The display device for an electronicapparatus according to claim 1, wherein the circular polarizing platecomprises a linear polarizing plate and a phase difference plate.
 4. Thedisplay device for an electronic apparatus according to claim 3, awherein the circular polarizing plate is positioned on an outer case ina planar direction.
 5. The display device for an electronic apparatusaccording to claim 3, wherein an adhesive layer is formed on any ofboundaries between the solar display board and the linear polarizingplate, between the linear polarizing plate and the phase differenceplate, and between the phase difference plate and the solar cell or amiddle frame.
 6. The display device for an electronic apparatusaccording to claim 3, wherein a diffusion layer is formed on any ofboundaries between the solar display board and the linear polarizingplate, between the linear polarizing plate and the phase differenceplate, and between the phase difference plate and the solar cell or amiddle frame.
 7. The display device for an electronic apparatusaccording to claim 3, wherein the linear polarizing plate transmits alinear polarizing component turned in a constant direction and absorbs alinear polarizing component in a direction orthogonal thereto.
 8. Thedisplay device for an electronic apparatus according to claim 3, whereinthe linear polarizing plate transmits a linear polarizing componentturned in a constant direction and reflects a linear polarizingcomponent in a direction orthogonal thereto.
 9. The display device foran electronic apparatus according to claim 5, wherein λ is thewavelength of the natural light incident on the linear polarizing plateand the phase difference plate is formed of a ¼λ plate or the {fraction(1/4)}λ plate a ½λ plate.
 10. The display device for an electronicapparatus according to claim 9, wherein the circular polarizing plate isprovided with the linear polarizing plate and the ¼λ plate in this orderin the direction of incidence of light.
 11. The display device for anelectronic apparatus according to claim 10, wherein the circularpolarizing plate is provided between a hand and the solar cell.
 12. Thedisplay device for an electronic apparatus according to claim 10,wherein the circular polarizing plate is provided between a liquidcrystal panel and the solar cell.
 13. The display device for anelectronic apparatus according to claim 1, wherein the solar displayboard includes a resin substrate having a pattern.
 14. The displaydevice for an electronic apparatus according to claim 13, wherein thesolar display board includes a resin substrate having a pattern and adecorating thin film member fixed to the resin substrate.
 15. Thedisplay device for an electronic apparatus according to claim 1, whereinthe solar display board has a first resin substrate, a decorating thinfilm member and a second resin substrate provided therein.
 16. Thedisplay device for an electronic apparatus according to claim 1, whereinthe solar display board includes an inorganic substrate having a patternselected from a glass, a sapphire glass and a ceramic plate.
 17. Thedisplay device for an electronic apparatus according to claim 16,wherein the solar display board further includes a decorating thin filmmember fixed to the inorganic substrate.
 18. The display device for anelectronic apparatus according to claim 16, wherein the solar displayboard is further provided with a resin substrate.
 19. The display devicefor an electronic apparatus according to claim 1, wherein the solardisplay board is provided with a first inorganic substrate selected froma glass, a sapphire glass and a ceramic plate, a decorating thin filmmember, and a second inorganic substrate selected from a glass, asapphire glass and a ceramic plate.
 20. The display device for anelectronic apparatus according to claim 1, wherein the solar displayboard uses one or more of a resin substrate, a decorating thin filmmember and an inorganic substrate selected from a glass, a sapphireglass and a ceramic plate in three or more layers.
 21. The displaydevice for an electronic apparatus according to claim 14, wherein thedecorating thin film member is a thin layer article formed of a naturalmaterial selected from the group consisting of a cloth, a paper, a shellor a wood, a ceramic sheet, a polarizing film, a coloring film, anelectroforming foil, an electrodeposited image, an etched image and ahologram image.
 22. The display device for an electronic apparatusaccording to claim 15, wherein the decorating thin film member is a thinlayer article formed of a natural material selected from the groupconsisting of a cloth, a paper, a shell or a wood, a ceramic sheet, apolarizing film, a coloring film, an electroforming foil, anelectrodeposited image, an etched image and a hologram image.
 23. Thedisplay device for an electronic apparatus according to claim 17,wherein the decorating thin film member is a thin layer article formedof a natural material selected from the group consisting of a cloth, apaper, a shell or a wood, a ceramic sheet, a polarizing film, a coloringfilm, an electroforming foil, an electrodeposited image, an etched imageand a hologram image.
 24. The display device for an electronic apparatusaccording to claim 19, wherein the decorating thin film member is a thinlayer article formed of a natural material selected from the groupconsisting of a cloth, a paper, a shell or a wood, a ceramic sheet, apolarizing film, a coloring film, an electroforming foil, an electrodeposited image, an etched image and a hologram image.
 25. The displaydevice for an electronic apparatus according to claim 20, wherein thedecorating thin film member is a thin layer article formed of a naturalmaterial selected from the group consisting of a cloth, a paper, a shellor a wood, a ceramic sheet, a polarizing film, a coloring film, anelectroforming foil, an electrodeposited image, an etched image and ahologram image.
 26. The display device for an electronic apparatusaccording to claim 15, wherein a pattern is given to one or more of thefirst resin substrate and the second resin substrate.
 27. The displaydevice for an electronic apparatus according to claim 18, wherein apattern is given to the resin substrate.
 28. The display device for anelectronic apparatus according to claim 19, wherein a pattern is givento one or both of the first inorganic substrate and the second inorganicsubstrate.
 29. The display device for an electronic apparatus accordingto claim 20, wherein a pattern is given to the resin substrate or theinorganic substrate.
 30. The display device for an electronic apparatusaccording to claim 13, wherein the resin substrate is a transparent orcolored translucent substrate.
 31. The display device for an electronicapparatus according to claim 15, wherein one or both of the first resinsubstrate and the second resin substrate is a transparent or coloredtranslucent substrate.
 32. The display device for an electronicapparatus according to claim 16, wherein the inorganic substrate is atransparent or colored translucent substrate.
 33. The display device foran electronic apparatus according to claim 19, wherein one or both ofthe first inorganic substrate and the second inorganic substrate is atransparent or colored translucent substrate.
 34. The display device foran electronic apparatus according to claim 20, wherein the resinsubstrate or the inorganic substrate is a transparent or coloredtranslucent substrate.
 35. The display device for an electronicapparatus according to claim 1, wherein the solar display board has apattern and includes a metal plate having a window portion opened.
 36. Amethod of manufacturing a display device for an electronic apparatusaccording to claim 13, wherein the resin substrate is bonded integrallywith the circular polarizing plate through a thermal press and a patternis transferred to the resin substrate by a pattern transfer methodthrough the thermal press using a pattern mold.
 37. A method ofmanufacturing a display device for an electronic apparatus according toclaim 15, wherein one or both of the first resin substrate and thesecond resin substrate is bonded integrally with the circular polarizingplate through a thermal press and a pattern is transferred to one orboth of the first resin substrate and the second resin substrate by apattern transfer method through the thermal press using a pattern mold.38. A method of manufacturing a display device for an electronicapparatus according to claim 16, wherein the inorganic substrate isbonded integrally with the circular polarizing plate through a thermalpress and a pattern is transferred to the inorganic substrate by apattern transfer method through the thermal press using a pattern mold.39. A method of manufacturing a display device for an electronicapparatus according to claim 19, wherein one or both of the firstinorganic substrate and the second inorganic substrate is bondedintegrally with the circular polarizing plate through a thermal pressand a pattern is transferred to one or both of the first inorganic andthe second inorganic substrate by a pattern transfer method through thethermal press using a pattern mold.
 40. A method of manufacturing adisplay device for an electronic apparatus according to claim 20,wherein the resin substrate or the inorganic substrate is bondedintegrally with the circular polarizing plate through a thermal pressand pattern is transferred to the resin substrate or the inorganicsubstrate by a pattern transfer method through the thermal press using apattern mold.
 41. The method of manufacturing a display device for anelectronic apparatus according to claim 36 wherein the resin substrateis bonded to the circular polarizing plate with an adhesive interposedtherebetween.
 42. The method of manufacturing a display device for anelectronic apparatus according to claim 37, wherein the first resinsubstrate or the second resin substrate is bonded to the circularpolarizing plate with an adhesive interposed therebetween.
 43. Themethod of manufacturing a display device for an electronic apparatusaccording to claim 38, wherein the inorganic substrate is bonded to thecircular polarizing plate with an adhesive interposed therebetween. 44.The method of manufacturing a display device for an electronic apparatusaccording to claim 39, wherein the first inorganic substrate or thesecond inorganic substrate is bonded to the circular polarizing platewith an adhesive interposed therebetween.
 45. The method ofmanufacturing a display device for an electronic apparatus according toclaim 40, wherein the resin substrate or the inorganic substrate isbonded to the circular polarizing plate with an adhesive interposedtherebetween.
 46. The method of manufacturing a display device for anelectronic apparatus according to claim 36, wherein the pattern moldserves to mold a pattern of an article having the pattern by using anelectric forming method.
 47. The method of manufacturing a displaydevice for an electronic apparatus according to claim 37, wherein thepattern mold serves to mold a pattern of an article having the patternby using an electric forming method.
 48. The method of manufacturing adisplay device for an electronic apparatus according to claim 38,wherein the pattern mold serves to mold a pattern of an article havingthe pattern by using an electric forming method.
 49. The method ofmanufacturing a display device for an electronic apparatus according toclaim 39, wherein the pattern mold serves to mold a pattern of anarticle having the pattern by using an electric forming method.
 50. Themethod of manufacturing a display device for an electronic apparatusaccording to claim 40, wherein the pattern mold serves to mold a patternof an article having the pattern by using an electric forming method.51. A display device for an electronic apparatus comprising a solar celland a middle frame for fixing a module having the solar cell to a case,and a circular polarizing plate for transmitting light being provided onthe front side of the middle frame and the solar cell in a direction ofincidence of light.
 52. The display device for an electronic apparatusaccording to claim 51, further comprising a solar cell display board fortransmitting light, the circular polarizing plate for transmitting lightbeing provided between the solar cell display board and the middleframe.
 53. The display device for an electronic apparatus according toclaim 52, wherein the solar cell display board, the middle frame and thecircular polarizing plate have identical outer shapes.